外壳脚本意外运算符

Question

我已经为这个问题苦苦挣扎了几个小时，并尝试了我在讨论板上能找到的一切。我无法切换到bash，这是bin/sh

。

问题出在 while 循环上，while [ $currentID -gt 0 ] .错误" 21: [: 2893: unexpected operator

#!/bin/sh
Menu_Option=0
echo "WELCOME"
echo "--------------------------------------------------------------"
while [ $Menu_Option -ne 4 ]
do
    echo "select a menu option"
    echo "1- ancestry history"
    echo "2- who is online"
    echo "3- what process any user is running"
    echo "4- exit"
    read Menu_Option
    case $Menu_Option in
  1)
        echo "THE ANCESTRY TREE FOR CURRENT PROCESS IS...."
        echo " "
        ps -ef > file1
        currentID=$(awk '{if ($3 == '$PPID') print $2}' file1)
        while [ $currentID -gt 0 ]
        do 
            Process_Name=$(awk '{if ($2 == $currentID) print $8 "  " $9}'     file1)

Answer 1

我希望

以下是您需要的：

#!/bin/sh
Menu_Option=0
echo "WELCOME"
echo "--------------------------------------------------------------"
while [ $Menu_Option -ne 4 ]
do
        echo "select a menu option"
        echo "1- ancestry history"
        echo "2- who is online"
        echo "3- what process any user is running"
        echo "4- exit"
        read -r Menu_Option
        case $Menu_Option in
        1)
                echo "THE ANCESTRY TREE FOR CURRENT PROCESS IS...."
                echo " "
                ps -ef > file1
                currentID=$(awk '{if ($3 == '$PPID') print $2}' file1)
                while [ "$currentID" -gt 0 ]
                do
                        Process_Name=$(awk '{if ($2 == '"$currentID"') print $8 "  " $9}'     file1)
                        echo "$Process_Name"
                        currentID=$(awk '{if ($3 == '"$currentID"') print $2}' file1)
                        if [ "$currentID" = "" ]
                        then
                                currentID=-1;
                        fi
                done
                echo ""
        esac
done